/* -------------------------------------------------------------------------
   CalOhm — sistema de diseño
   -------------------------------------------------------------------------
   Identidad: instrumento digital de bolsillo para electricistas. Geometría
   técnica, azul opaco funcional (no decorativo), lecturas numéricas en
   monoespaciada, jerarquía por bordes y tipografía en vez de sombras.
   ------------------------------------------------------------------------- */

:root {
  /* ---- Color: modo claro ---- */
  --color-bg: #f3f4f7;
  --color-bg-panel: #eceef2;
  --color-surface: #ffffff;
  --color-text: #14181f;
  --color-text-secondary: #5b6472;
  --color-text-tertiary: #8992a3;
  --color-border: #d7dbe3;
  --color-border-strong: #b9c0cd;

  --color-primary: #2f5fa0;
  --color-primary-dark: #1f4478;
  --color-primary-tint: #e8eef7;
  --color-on-primary: #ffffff;

  --color-success: #1f7a4d;
  --color-success-tint: #e5f3ec;
  --color-warning: #a8690f;
  --color-warning-tint: #faf0e0;
  --color-error: #b23b3b;
  --color-error-tint: #fbebeb;
  --color-neutral: #5b6472;
  --color-neutral-tint: #eceef2;

  --shadow-sm: 0 1px 1px rgba(20, 24, 31, 0.04);
  --shadow-md: 0 1px 2px rgba(20, 24, 31, 0.06);

  /* ---- Tipografía ---- */
  --fuente-ui:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  --fuente-lectura:
    "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* ---- Radios ---- */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* ---- Espaciado ---- */
  --space-4: 4px;
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;
  --space-40: 40px;
  --space-48: 48px;

  /* ---- Target táctil ---- */
  --target-min: 44px;
}

[data-theme="oscuro"] {
  --color-bg: #10141b;
  --color-bg-panel: #171d27;
  --color-surface: #171d27;
  --color-text: #e7ebf2;
  --color-text-secondary: #9aa4b5;
  --color-text-tertiary: #6d7789;
  --color-border: #2a3140;
  --color-border-strong: #3a4356;

  --color-primary: #5a8bd6;
  --color-primary-dark: #3f6bb0;
  --color-primary-tint: #1a2635;
  --color-on-primary: #0d1420;

  --color-success: #3fa877;
  --color-success-tint: #142620;
  --color-warning: #d19a3d;
  --color-warning-tint: #2a2117;
  --color-error: #d16868;
  --color-error-tint: #2b1a1a;
  --color-neutral: #9aa4b5;
  --color-neutral-tint: #1c222c;

  --shadow-sm: 0 1px 1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 1px 2px rgba(0, 0, 0, 0.35);
}

/* ---- Reset base ---------------------------------------------------- */
* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--fuente-ui);
  -webkit-tap-highlight-color: transparent;
}

body {
  min-height: 100vh;
  padding-bottom: env(safe-area-inset-bottom);
  font-size: 15px;
  line-height: 1.5;
}

h1,
h2,
h3,
p,
dl,
dd,
fieldset,
legend {
  margin: 0;
  padding: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

#app {
  max-width: 560px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

@media (min-width: 900px) {
  #app {
    max-width: 1080px;
  }
}

/* ---- Topbar de inicio: nameplate del instrumento -------------------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-12);
  padding: var(--space-20) var(--space-20) var(--space-16);
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-bottom: 3px solid var(--color-primary-dark);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-12);
}

.brand__mark {
  font-family: var(--fuente-lectura);
  font-size: 22px;
  font-weight: 700;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-sm);
}

.brand__title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand__subtitle {
  font-size: 11.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0.85;
}

.icon-btn {
  background: transparent;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
  color: inherit;
  width: var(--target-min);
  height: var(--target-min);
  min-width: var(--target-min);
  border-radius: var(--radius-sm);
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    background-color 120ms ease,
    border-color 120ms ease;
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.12);
}

.icon-btn:active {
  background: rgba(255, 255, 255, 0.2);
}

/* ---- Encabezado de pantalla secundaria: breadcrumb técnico ---------- */
.topbar--screen {
  background: var(--color-surface);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-12) var(--space-16);
}

.topbar--screen .icon-btn {
  border-color: var(--color-border-strong);
  color: var(--color-text-secondary);
}

.topbar--screen .icon-btn:hover {
  background: var(--color-bg-panel);
}

.topbar--screen__eyebrow {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  display: block;
  margin-bottom: 2px;
}

.screen-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

/* ---- Home / catálogo de cálculos ------------------------------------ */
.home-grid {
  padding: var(--space-16);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  flex: 1;
  align-content: start;
}

.home-grid__label {
  grid-column: 1 / -1;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  padding: 0 var(--space-4) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-4);
}

.tool-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: var(--space-16) var(--space-12);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-8);
  color: var(--color-text);
  text-align: left;
  min-height: 108px;
  transition:
    border-color 120ms ease,
    background-color 120ms ease;
}

.tool-card:hover {
  border-color: var(--color-primary);
}

.tool-card:active {
  background: var(--color-bg-panel);
}

.tool-card--principal {
  grid-column: 1 / -1;
  min-height: 96px;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-16);
}

.tool-card--principal .tool-card__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.tool-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.tool-card__icon {
  font-family: var(--fuente-lectura);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.tool-card--principal .tool-card__icon {
  width: 36px;
  height: 36px;
  font-size: 19px;
}

.tool-card__arrow {
  font-size: 15px;
  color: var(--color-text-tertiary);
}

.tool-card__nombre {
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.tool-card--principal .tool-card__nombre {
  font-size: 15px;
}

.tool-card__desc {
  font-size: 11.5px;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

.disclaimer {
  padding: var(--space-16) var(--space-20) var(--space-24);
  font-size: 11px;
  line-height: 1.55;
  color: var(--color-text-tertiary);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-8);
}

/* ---- Formularios ------------------------------------------------------ */
.form {
  padding: var(--space-16);
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
  flex: 1;
}

.form-section-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-top: var(--space-8);
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.field__label {
  font-size: 12.5px;
  color: var(--color-text-secondary);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.field__control {
  position: relative;
  display: flex;
  align-items: stretch;
}

.field input,
.field select {
  width: 100%;
  font-family: var(--fuente-lectura);
  font-size: 17px;
  font-weight: 600;
  padding: 12px 14px;
  min-height: var(--target-min);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-text);
  transition:
    border-color 120ms ease,
    box-shadow 120ms ease;
  -moz-appearance: textfield;
}

.field select {
  font-family: var(--fuente-ui);
  font-size: 14.5px;
  font-weight: 500;
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--color-text-tertiary) 50%),
    linear-gradient(135deg, var(--color-text-tertiary) 50%, transparent 50%);
  background-position:
    calc(100% - 18px) center,
    calc(100% - 13px) center;
  background-size:
    5px 5px,
    5px 5px;
  background-repeat: no-repeat;
  padding-right: 36px;
}

.field input::-webkit-outer-spin-button,
.field input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.field input:focus,
.field select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-tint);
}

.field__control--with-unit input {
  padding-right: 44px;
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  border-right: none;
}

.field__unit {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  padding: 0 10px;
  font-family: var(--fuente-lectura);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text-secondary);
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border-strong);
  border-left: none;
  border-top-right-radius: var(--radius-sm);
  border-bottom-right-radius: var(--radius-sm);
}

.field-group {
  border: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.field-group legend {
  font-size: 12.5px;
  color: var(--color-text-secondary);
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 0;
  margin-bottom: var(--space-4);
}

.segmented {
  display: flex;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.segmented__opt {
  flex: 1;
  border: none;
  border-right: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 11px 8px;
  min-height: var(--target-min);
  font-size: 12.5px;
  font-weight: 600;
  transition:
    background-color 120ms ease,
    color 120ms ease;
}

.segmented__opt:last-child {
  border-right: none;
}

.segmented__opt:hover {
  background: var(--color-bg-panel);
}

.segmented__opt.is-active {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.field-error {
  min-height: 14px;
  color: var(--color-error);
  font-size: 12px;
  font-weight: 600;
}

.divider {
  height: 1px;
  background: var(--color-border);
  border: none;
  margin: var(--space-4) 0;
}

/* ---- Botones ------------------------------------------------------ */
.btn {
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  min-height: var(--target-min);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition:
    background-color 120ms ease,
    border-color 120ms ease,
    opacity 120ms ease;
}

.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-on-primary);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn--primary:active {
  opacity: 0.9;
}

.btn--secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--secondary:hover {
  background: var(--color-primary-tint);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.is-hidden {
  display: none !important;
}

/* ---- Resultado: visor tipo instrumento ------------------------------- */
.result {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.result__label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  padding: var(--space-12) var(--space-16) 0;
}

.result__primary {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-8);
  padding: var(--space-8) var(--space-16) var(--space-16);
  text-align: center;
}

.result__value {
  font-family: var(--fuente-lectura);
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.result__unit {
  font-family: var(--fuente-lectura);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.result__note {
  font-size: 12px;
  color: var(--color-text-secondary);
  text-align: center;
  padding: 0 var(--space-16) var(--space-12);
  margin-top: -8px;
}

/* Indicador de estado — nunca depende solo del color */
.status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  padding: var(--space-8) var(--space-16);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.status__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status--ok {
  color: var(--color-success);
  background: var(--color-success-tint);
}
.status--ok .status__dot {
  background: var(--color-success);
}

.status--warn {
  color: var(--color-warning);
  background: var(--color-warning-tint);
}
.status--warn .status__dot {
  background: var(--color-warning);
}

.status--fail {
  color: var(--color-error);
  background: var(--color-error-tint);
}
.status--fail .status__dot {
  background: var(--color-error);
}

.status--neutral {
  color: var(--color-neutral);
  background: var(--color-neutral-tint);
}
.status--neutral .status__dot {
  background: var(--color-neutral);
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--color-border);
}

.result-grid > div {
  background: var(--color-surface);
  padding: var(--space-12) var(--space-16);
}

.result-grid dt {
  font-size: 10.5px;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
}

.result-grid dd {
  margin: 2px 0 0;
  font-family: var(--fuente-lectura);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
}

.notice {
  font-size: 12px;
  line-height: 1.5;
  color: var(--color-text-secondary);
  padding: var(--space-12) var(--space-16);
  border-top: 1px solid var(--color-border);
}

.notice--pending {
  color: var(--color-warning);
  background: var(--color-warning-tint);
}

/* ---- Ver cálculo: manual técnico ------------------------------------- */
.ver-calculo {
  border-top: 1px solid var(--color-border);
}

.ver-calculo summary {
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--color-primary);
  padding: var(--space-12) var(--space-16);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ver-calculo summary::-webkit-details-marker {
  display: none;
}

.ver-calculo summary::after {
  content: "+";
  font-size: 15px;
  color: var(--color-text-tertiary);
}

.ver-calculo[open] summary::after {
  content: "−";
}

.ver-calculo pre {
  white-space: pre-wrap;
  font-family: var(--fuente-lectura);
  font-size: 12px;
  line-height: 1.65;
  margin: 0;
  padding: 0 var(--space-16) var(--space-16);
  color: var(--color-text);
  background: var(--color-bg-panel);
}

/* ---- Responsive: desktop en paneles ----------------------------------- */
@media (min-width: 900px) {
  .home-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .tool-card--principal {
    grid-column: 1 / -1;
  }

  .form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: start;
    gap: var(--space-16) var(--space-32);
    padding: var(--space-24) var(--space-32);
  }

  .form > .btn,
  .form > .field-error,
  .form > .divider,
  .form > .form-section-label {
    grid-column: 1;
  }

  .form > #ct-resultado,
  .form > #i-resultado,
  .form > #p-resultado,
  .form > #s-resultado,
  .form > #q-resultado,
  .form > #fp-resultado {
    grid-column: 2;
    grid-row: 1 / span 30;
    position: sticky;
    top: var(--space-24);
  }

  .result__value {
    font-size: 52px;
  }
}